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a2a47c6c KS |
1 | /* |
2 | * HyperV Detection code. | |
3 | * | |
4 | * Copyright (C) 2010, Novell, Inc. | |
5 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9fa02317 | 9 | * the Free Software Foundation; version 2 of the License. |
a2a47c6c KS |
10 | * |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
14 | #include <asm/processor.h> | |
e08cae41 | 15 | #include <asm/hypervisor.h> |
a2a47c6c KS |
16 | #include <asm/hyperv.h> |
17 | #include <asm/mshyperv.h> | |
18 | ||
e08cae41 | 19 | struct ms_hyperv_info ms_hyperv; |
a2a47c6c | 20 | |
e08cae41 | 21 | static bool __init ms_hyperv_platform(void) |
a2a47c6c | 22 | { |
e08cae41 PA |
23 | u32 eax; |
24 | u32 hyp_signature[3]; | |
a2a47c6c | 25 | |
e08cae41 PA |
26 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
27 | return false; | |
a2a47c6c | 28 | |
e08cae41 PA |
29 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
30 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 31 | |
e08cae41 PA |
32 | return eax >= HYPERV_CPUID_MIN && |
33 | eax <= HYPERV_CPUID_MAX && | |
34 | !memcmp("Microsoft Hv", hyp_signature, 12); | |
a2a47c6c KS |
35 | } |
36 | ||
e08cae41 | 37 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 38 | { |
a2a47c6c | 39 | /* |
e08cae41 | 40 | * Extract the features and hints |
a2a47c6c | 41 | */ |
e08cae41 PA |
42 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
43 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); | |
a2a47c6c | 44 | |
e08cae41 PA |
45 | printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", |
46 | ms_hyperv.features, ms_hyperv.hints); | |
a2a47c6c | 47 | } |
e08cae41 PA |
48 | |
49 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
50 | .name = "Microsoft HyperV", | |
51 | .detect = ms_hyperv_platform, | |
52 | .init_platform = ms_hyperv_init_platform, | |
53 | }; | |
96f6e775 | 54 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |